Work-guide for sewing-machines.



No. 742,361.v

J. c. HARPER. x l wo-Rx GUIDE Pon SEWING MAGHINES.

AlLlOATIOI 'FILED 001130. 1902.

l0 MODEL.

PATENT@ Nov, s, 1903.

' J; c. HARPER.

wom GUIDE ron Simms' MACHINES.

APHJOATIDX FILED 0 01. 30. 1902.

l0 XODEL.

l S2 SETS-551121'- 2.

PATBNTBD .Nom 3, 1903.v

atented 'November 3, 1908.

'PATENT Orsi-cs.

JOHN C. H ARIER, OF LINCOLN, NEBRAS KA.'

WORK-culos Fos si-:wmmM/tci-xmss'.

specificazioni ronnie?. parte: :neem rate-nt Np. 742,136?, assedNovember s, isos.

Application ASled Gotcha! 30, 1902. Serialle. 139,442- (Xen-edel.)

.'Ig'a all whom it may can-nem:

Be it known that I, JOHN C. HARPER, a citizen of the United States,residing ut Lincoln,

4in the county of Laucaster'and State of Nebraska, have invented a newand useful Work- Guide for Sewing-Machines, o! whichthe -following is aspecification.

The object of the present invention isto provide an improved form ofwork-guide in the natu re of an attachment which may be ap plied towax-thread machines of ordinary co-nstruction for guiding the JWerl; inthe-formation of rounds and other classes of leather goods, such as areused for reins and' other portions o harness.

One of the principal objects of the invention is to provide a work-guidein which nearly all of the mechanism is disposed below the workplate andout of the way of the operator and the stock. A further object is topro. vide an improved form of adjustable guide forproperly supportingand holding the work in place during sewing, and a still further o jectis to insure the proper insertion and hol ing of the lilling-in place inthe outer portion of the leather without regard to the width of theliller.

A still further object-of the invention is to provide the attachmentwith a channeling or grooviug knife which may be adjusted to-cut s.groove at any desired position or of any desired depth in the leather. Y

A still further object of the invention is to so arrange the machine asto provide for the formation of bifurcated straps, such as are used forwinker-braces and' other portions of the harness. y

With these and other obects in view the invention consists in the novelconstruction and arrangement of parts hereinafter de scribed,illustratedin the accom panyin g drawings, and particularly pointed out intheappended claims.

In the drawings, Figure 1 Ais a perspective view of a work-,guideattachmeut'constructed in accordance with the invention. Fig. 2 is aninverted plan view of the same. Fig. 3 is alongitudinal sectionalelevation of the workguide. Fig. 4 is an end elevation of the same. Fig.5 is a transverse sectional elevation of the guide on the' line 5 5 ofFig. 2. Fig. 6 is a view similar to Fig.1, showing the guide undercutguides 14 'for the reception of n lou adjusted for the manufacture ofhifurcnted straps and illustrating 'also the application of theadjustable channeling orgrooving knife. 5s

' Fig. 7 is .fm inverted plsu view of the device' with the partsarranged as illustrated in Fig.

G. Fig. 8,is a longitudinnl sectional elevn- Ation of the guide on theline S S of Fig. 7.

Fig. 9 is a transverse sectional elevation of the device on the line 9 9of Fig.7.

Similar nnrneralsof reference nre employed to indicate correspondingparts throughout the several figures of the drawings.

The worlcplate 10 of the attachment is provided with a plurality ofopenings 11 for the reception of the usual securing-studs formed on theNational, Campbell, and otherforms of wax-thread machine of ivellfknowncoustruction, and in said vieri; plate is also formed a transverseopening 12 for the pnssage of .the usual wl und needle to form thestitches.

0n the underside of the plate nre a pair of gitudinnlly-movable slide15, having a socket 16 for the reception of a pin 17, having n reducedend portion 18 extending through a guiding-opening in the renr portionof the slide. Surrounding the reduced portion of the pin isacompnessior'i-spriug normally tendingto force the pin outwardly, andthis movemeut is limited by a stop-pin 19', secured' to the pinandextending through a slot 20 in the slide. In the work-plate is anopening 2l, extending longitudinally* of the plate, and through saidopening passes a block 22, secured at its lower end to the end ol' thepin 17. In order to accurately' guide `the block, the portion 23,' whichextends through the slot 21, is of-a width just about equal to that ofthe slot, the walls of the latter preventing any lateral movement of theblock. The block is provided with -a threaded openngfor 'the receptionof the lower end of Aa stud or screw 2t, on which is mounted a. guiding-'wheel 25, having a concaved periphery for `engaging the curved surfaceof the leather and holding the same in proper positionidur ing thesewing operation, the compressionspring serving to hold the rollerfirmly against Y '2- TIV 742.887

In the under side of theslide 15 isaslot 26, having rounded side wallsand adapted for the reception of an operatingdever 37, pivoted on ascrew 2S and adapted to engage with a holding-luf: 29 on the under sideof the bedplate to hold the slide undroller against the work. When itbecomes necessary to insert a fresh piece of workin position, the leveris depressed to :tn extent sut'iicientto release it from the lug 29, andit may then be moved to adjust the roller any required distance from thework. Tite lever is contined to the work-plate at ono end in .suchmanner as to canse its free end to spring upwardly, so that itwould 'Deheld firmly in eugagementwith the lng 29 during the operation of themachine..

In the work-plute is formed al-ougitudiuallydisposed slot 32, in whichis guided a slide 33, the rear end of which is tn rued downwardly undysecured to or formed integral with a pin 34, adapted to a gnidiugopeuiugin n block 35, secured to the under side of tho work-plate. The pin 34is acted upon by n compression-,spring 36, normally tending t0 force thesame in thodireotion of the con caved roller 25, and the end of theguidingopeuing is threaded forthe reception of a screw.37, whereby thestress ot'v the spring may be adjusted. Lateral play of the slide 33 isprevented by the side walls of the slot 32, and vertical movement isprevented partly by the pin St and partly by a plate 38, forming aportion of the work-plate and extending over the rear end of the slide.The front portion of the slide rests directly o'n the upper surface ofthe \\ork-plntc, and its movement in the direction of the transverseslot t 1:? is limited by au adjustable work-guide-lO.

The work-guide 40 is formell of` a comparatively'uarrow strip of metalhaving widened and downwardly-turned cn-d portions to engage with thesido edges of the plate, and in one of the wider portions is n. slot 41,through which extends a locking-screw 42 into nu opening in thework-plate. This permits of the adjustment of the guide from and towardthe needle-opening 12 to accommodate work of different. character andafford a guide and rest for the material for the fullwidth of thework-plate and at the same time adjusts the extent of forward movementofv the slide 33.

For forming the ordinary rounds, such as shown in cross-section in Fig.3, in which a filler is sewed between the edges of a bent piece ofleather, I employ a pressing-roller 43 for engaging the edge of thetiller and forcing the same into the bent' strip, while the outer curvededge of 'said strip is acted upon 'by the concaved roller 25, and thetwo compression-springs act on the roller in such manner as to insurethe forcing of the filling-piece into the bent strip Aof leather. Thelower edge of the bent strip is properly guided byv the'guide-plate 40,and the row of stitching is therefore always parallel with this loweredge, while anyguncvenness or surplus material will be forced beyond theline of the up per portion of the row of stitching in the di 'rectiono-f the roller 43.

'In some classes ot work, particularly in the form-ation of thebifurcated wiukenbrnces, the roller 43 could not bo employed if thestitching is to be carried up to the point of bifurcation, and toprovide for this I employ an auxiliary guard in the form of a thintapering tongue 4G, having a laterally-project# ing plate 4T, which maybe secured to the slide 33 in place of the roller. The metallic tongue,'while not as etlieient as the roller, permits the formation of the lineof stitching close to the point of bifurcation.

In the manu facture of leather rounds it is usual to groove or score theleather to conceal the stitches and permit the cuttingaway and trimmingof the edges of the leather in the subsequenttreatment, one of thescoringknives being carried by the presser-foot and.

In the present the other by the work-plate. instance Ietnployas'corittg-knfe 50,mounted on a pin 51,:tdupted to a suitablesocket in a block 52, secured to the bottom of the bed plate. The pin 5lmay be moved longitudinally to effect the proper adjustment of thescoring-knife with respect to the stitch-form ing mechanism and may berotated in order to project the blade for a greater or less distanceabove theupper surface of the workplate 4to l'oru't a groove of anydesired depth.

The attachment is found convenient in that no portions of the mechanismexcept those in actual contact with the work are above the work-plate,the upper surface being perfectly clear and permitting the bettermanipulation of the stock than where the springs and can ryiug devicesare on top of the plate.

While the construction herein described,V

and illustrated in the accompanying drawings, is the preferred formofthe device, itis obvious that vari-ous changesin the form,proportions, size, and minor details ot' the struc; ture muy be madewithoutdeparting from the spirit or sacrificing any ofthe advantages ofthe invention.

Having thus described the'invehtion, what I claim is 1. Awork-guidingattachme-nt for sewingmachines, comprising a slottedwork-plate, a.

guided block disposed'below the Werk-plate, means for adjusting theblock longitudinally ofthe plate, a slide guided in one of theplateslots and having a projecting pin adapted'to a socketin the block,a spring'tending to force the slide away from the block, a concavedguiding-roller mounted on said slide at a pointl above. the Work-plateand adapted to 'engage one side of the work, and a cooperative gnid ingdevice for engaging the opposite side of the work.

2. A work-guiding attachment for sewingmachines, compris-ing awork-plate having a. longitudinal slot, a slide guided therein, a pincarried-by the slideat a point below the workplate, said pin having anendportion of r- Aduced diameter, a guided block having a socket for thereception of Said pin, :x compression-spring surrounding the reducedportion of the pin and tending to force the pin 5 from the socke,sten-piu married by said r "spring-pressed pin aud extending through aslot in the block, a spring lockingdefver pivomliy'councclede the underside of the workpiate and adapted to engage in n slot. in said loblock,nlockingiiig fax-engagement with said lever, a concm'edworkguiding roilersecuned to the slide at a point, above the -work-pinte:md adapted to engage with one side of the.

work, and a copcmtive guidingdevice ad3pt x5 ed to engage with theopposizeside of the.

work. 3. A work-guiding `attachment for sewingmachines, comprising nslotted plate, a slide guided therein, an auxiliary plate 38 forming zopart ofthe work-plate aud 'sending to 'prevent vupward movement .of theslide, n. bio'ck se- In testimony that I claim the foregoing :is my ownIlmve heretoniixed my signature in 35 the presence of two witnesses.-

' JOHN C. HARPER.

Witnesses: Y j

En. v Guommanx, Eo. CERF.

